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A young man tries new Vuzix Blade augmented reality smart glasses Prosumer on the first day of the Mobile World Congress (MWC) on February 26, 2018 in Barcelona. The Mobile World Congress, the world's biggest mobile fair, is held in Barcelona from February 26 to March 1. (AFP/Josep Lago)

From headsets that help you lose weight without dieting to a smart meat thermometer, here are five eye-catching devices on display at the Mobile World Congress, wireless industry's biggest conference which got underway Monday in Barcelona:

Smart bike lock

Tired of bending down to lock your bike? A team of South Korean engineers have developed a small circular device that is installed on the hub of the front wheel and is connected to the owner's smartphone via Bluetooth.

When the bike owner stops riding and walks away, the device -- dubbed Bisecu -- automatically locks itself. When the rider returns, it detects that too and it will unlock.

Any thief who tries to ride off with the bike would find the front wheel frozen in position -- and a 100 decibel alarm would also be triggered and the owner notified on their phone that the bike is being tampered with.

Weight loss headset

British startup Neurovalens presented a headset that generates a low-level electrical pulse which sends a signal to the brain to burn fat and lose weight.

The company's head Jason McKeown said 80 percent of those who have used the Modius headset have lost weight. It comes with an app that allows you to track your progress.